You can edit all details of an Event after it has been created, even the Ticket information.
Go to Events > Upcoming Events displays your current Events.
Click View Details to bring up the Event main information screen to view all the information about the Event.
The Event's management screen now appears. On this screen you can:
Edit the Event's information (including Tickets)
View Attendees (or even manually add Attendees)
Duplicate the Event (for regular or repeating Events) under More Options
Share the Event (via Twitter, Google+ or Facebook) and,
Send Invites (via Share the Event and select Send Invites)